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DC Motors

DC Motors
A dc motor can be easily identified by

Commutator
Winding
Yoke
Size of conductor

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DC Motors
Excessive sparking at brushes may be caused due to

Misaligment of machine
Worn bearings
Loose coupling
Dirt on the commutator

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DC Motors
In a D.C. generator, the iron losses mainly take place in

Armature rotor
Yoke
Commutator
Armature conductors

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DC Motors
In a dc motor constant torque is produced due to

Pole shoes
Rotor laminations
Commutator
End plates

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DC Motors
______ motors never use belt connected loads.

Series
Shunt
Differentially compounded
Cummulative compounded

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DC Motors
If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking

None of these
Plugging
Dynamic braking
Regenerative

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